5x^2-9x-5=0

Simple and best practice solution for 5x^2-9x-5=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 5x^2-9x-5=0 equation:


Simplifying
5x2 + -9x + -5 = 0

Reorder the terms:
-5 + -9x + 5x2 = 0

Solving
-5 + -9x + 5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-1 + -1.8x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -1.8x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -1.8x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.8x + x2 = 0 + 1
-1.8x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-1.8x + x2 = 1

The x term is -1.8x.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8x + 0.81 + x2 = 1 + 0.81

Reorder the terms:
0.81 + -1.8x + x2 = 1 + 0.81

Combine like terms: 1 + 0.81 = 1.81
0.81 + -1.8x + x2 = 1.81

Factor a perfect square on the left side:
(x + -0.9)(x + -0.9) = 1.81

Calculate the square root of the right side: 1.345362405

Break this problem into two subproblems by setting 
(x + -0.9) equal to 1.345362405 and -1.345362405.

Subproblem 1

x + -0.9 = 1.345362405 Simplifying x + -0.9 = 1.345362405 Reorder the terms: -0.9 + x = 1.345362405 Solving -0.9 + x = 1.345362405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 1.345362405 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 1.345362405 + 0.9 x = 1.345362405 + 0.9 Combine like terms: 1.345362405 + 0.9 = 2.245362405 x = 2.245362405 Simplifying x = 2.245362405

Subproblem 2

x + -0.9 = -1.345362405 Simplifying x + -0.9 = -1.345362405 Reorder the terms: -0.9 + x = -1.345362405 Solving -0.9 + x = -1.345362405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -1.345362405 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -1.345362405 + 0.9 x = -1.345362405 + 0.9 Combine like terms: -1.345362405 + 0.9 = -0.445362405 x = -0.445362405 Simplifying x = -0.445362405

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.245362405, -0.445362405}

See similar equations:

| 210=n+0 | | 2+(1.25+1.25)= | | -7x-1=17x-31 | | 4x+13=5x+16 | | -7=9p+8 | | (3x+1)(2x-1)=144 | | 85x=720 | | 2+1.25m= | | 8x+9+15-37-6y+11x= | | 13d+3=5d+75 | | f(x)=5x^4-4x^5 | | 210y=2100 | | 11w+17=72 | | 12c^2-c+30= | | 9x-20=12x-11 | | 14.8=6c-2 | | 49+x=100 | | 3x+150=7x | | 2e-9=0.2 | | 38=8c-2 | | 6n+7-3n-14=4n+8 | | x+134=150 | | 2x+4x=28 | | 4x+6y=82.7 | | 15+n=11+8 | | x(x-3)=x*x+5x+7 | | 3(2-4x)=5(1-4x) | | 11=3h+3 | | 6(x+6)=8(x-8) | | 4(2m+1)=16m | | 4x-2mx+2m-3=0 | | 9w+3=5w-21 |

Equations solver categories